Home Loan

In the middle of June 15 I called Fnb home loans wanting to find out which date our 1st debit order will be going off. To my surprise I was told that the debit was returned unpaid on the 1st of June 15 then I asked the call centre agent how come the debit order was unpaid she then told me incorrect banking details was given to Fnb. I requested her to go have a look at the contract we signed and just confirm the details. I got a call back from an agent apologising for the details that's been captured incorrectly and that it has been fixed. Ever since that day I have been received numerious calls requesting immediate payment. I requested to pay the amount off but the agents keep saying I must speak to a manager and puts me on hold for more than 20 mins. On Friday 10 July 15 we received a legal letter requesting immediate payment I called the call centre again and was put on hold. on Monday 13 July I called again same thing happened had to hold on for the manager whom I never spoke to. I feel that the treatment we received from Fnb is very poor as this was their fault and not ours. I need this matter sorted out Asap.